| 摘要 |
The present invention is directed to improve precision of tracking correction and focus correction while assuring stability of the tracking correction and focus correction during recording/reproducing of data to/from an optical disk. Before start of recording/reproduction, an optical disk DK is searched once. On the basis of a radial acceleration component in a tracking error signal Ste, an area where a mechanical distortion occurs in the optical disk DK is specified. At the time of actually recording/reproducing data to/from the optical disk DK, the gain in a tracking servo circuit TS is temporarily improved only at the time of recording/reproducing data to/from the area specified as an area where a mechanical distortion or the like occurs. Also, even in the case where the gain is varied by performing optimum phase compensation on the gain set by using an optimum phase compensation by-gain circuit 23, reliable phase compensation is realized. Concerning the focus correction, also, gain compensation and phase compensation are performed using a method similar to that of the tracking correction.
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